Microsoft Patches Three Actively Exploited Zero-Days
IPA warns that three Microsoft vulnerabilities are being actively exploited in the wild and urges immediate patching.
Sourceipa.go.jp — open the original
What to check
- Applies to
- The 3 CVEs named below. Whether you run an affected version is not assessed: check the versions the source lists.
- Exploitation
- CISA lists CVE-2021-31979, CVE-2021-33771, and CVE-2021-34448 as exploited in the wild.
Japan's IPA issued an alert on July 14, 2021 regarding a Microsoft security update addressing multiple vulnerabilities. Among these, Microsoft confirmed active exploitation of CVE-2021-34448 (a scripting engine memory corruption vulnerability), CVE-2021-33771 (a Windows kernel elevation of privilege vulnerability), and CVE-2021-31979 (a Windows kernel elevation of privilege vulnerability). These flaws could allow attackers to crash applications or gain control of affected systems.
Given the confirmed in-the-wild exploitation, IPA urged users and organizations to apply Microsoft's patches immediately through Windows Update to prevent further damage. The advisory is largely informational, directing readers to Microsoft's official patch channels and the IPA Security Center for guidance, without providing additional technical details on the exploitation methods or threat actors involved.
Mentioned in this report
Source reporting: https://www.ipa.go.jp/archive/security/security-alert/2021/20210714-ms.html
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